LEGO 8878 POWER FUNCTIONS Rechargeable Battery Box

Charge up your LEGO Power Functions! br/ br/ No more disposable batteries! This rechargeable battery box has built-in Lithium polymer batteries for low weight and maximum power. Use it in your LEGO Power Functions models and never have to use disposable batteries again! br/ br/ Use the #8887 10VDC LEGO Transformer to charge the battery! br/ Motor speed can be controlled via the battery box speed control dial! br/ Output voltage is 7.4 V!